A student observes a black coating on silver coins and green coating on copper coins, which chemical phenomenon is responsible for these, write the chemical name of black and green coatings.
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The phenomenon is known as corrosion. Air contains traces of hydrogen sulphide gas which reacts with silver metal present in the coin to form silver sulphide. It is black in colour.
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Answer:
Black coating on silver coins due to silver sulphide (Ag2s)
2Ag +H2S ------Ag2s+H2( formula fir silver sulphide)
Green coating on copper due to copper carbonate and copper hydroxide .
2Cu+H2O+CO2+O2---------Cu (oH) twice+CuCo3.
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